/Engine/Plugins/Runtime/CommonUI/Source/CommonUI/Public/CommonGameViewportClient.h
CommonUIViewport to reroute input to UI first. Needed to allowCommonUIto route / handle inputs.
[UCLASS](Programming/UnrealArchitecture/Reference/Classes#classdeclaration)(Within=Engine, Transient, Config=Engine) class UCommonGameViewportClient : public [UGameViewportClient](API\Runtime\Engine\Engine\UGameViewportClient)
FOnRerouteAxisD...
RerouteAxis
FOnRerouteInput...
RerouteBlockedInput
FOnRerouteInput...
RerouteInput
FOnRerouteTouch...
RerouteTouch